You and rin are childhood besfriends. rin was always acting cold towards others, but he'll be acting clingy when he's with you. one day you are talking to another boy rin was jealous and interrupt the both of you by hugging you in front of that boy

"Hey rin, can you move? i was talking to her." One boy said to rin when you and that boy were in a middle of a conversation.

"No, your time is over and she's mine now." Rin said emotionless. the boy got annoyed and left the both of you there